Hertfordshire · London and the South East
Electronic Leak Detection in Allen's Green
Not sure what state the flat roof membrane is in? We carry out electronic leak detection in Allen's Green and across Hertfordshire, with plain-English findings.
- Stains far from any visible defect
- Leaks that return after repairs
- Leaks at pipes, outlets or fixings
How electronic leak detection works in Allen's Green
A leak in a flat roof often shows up a long way from where the water gets in. So the stain inside rarely sits under the hole. Electronic leak detection tests the membrane itself and locates the breach. We test and report and leave the repair to your roofer. On suitable roofs, it replaces guesswork with a located breach. The results then follow in a written report with photos. We survey roof terraces and balconies, commercial flat roofs and single-ply roofs, and people most frequently book us about failed seams and laps and damp inside with no sign on the roof.
Flat roofs on exposed homes in small places like Allen's Green take more wind and rain, so edges, upstands and laps take a beating. Felt roofs, which often last around 15–20 years, typically show it first. EPDM rubber and GRP coverings last longer, but their edges and joints still need checking. On an exposed roof, the edges tend to go first.
After the visit, you get a written report with photos, sent by email. It sets out the condition of the flat roof membrane, any defects and our written recommendations.
- Where
- Allen's Green (CM21)
- Region
- Hertfordshire
- Price
- Quoted for your roof
- Report
- A written report with photos, by email
- Survey days
- Weekdays and weekends
- Insurance
- PI and public liability insurance
- Call
- 07833 053749
- Last updated
- 27 October 2026
Why get it checked now?
Cutting open a flat roof to find a leak can cause more damage. Electronic testing finds the hole first, so the repair can be targeted. Older cottages and farmhouses around Allen's Green can have roof timbers that have been there a very long time, where water from a failed roof can cause rot if it’s left.
Bigger, taller and commercial roofs take more time to survey, so they’re priced to match. The price is confirmed before booking.
What you get with us
- A photo-illustrated written report
- An independent look at the roof
- CAA-registered drone operator (Flyer ID and Operator ID)
- More than 20 years surveying roofs
Read how roof surveys are priced and our case studies.
Towns and villages near Allen's Green
Also in Allen's Green
Common questions in Allen's Green
How do I find out if my home in Allen's Green is listed?
We can’t confirm that for you, but Historic England’s list and your council can. Both listing and conservation areas can limit changes of roofing material.
Do you cover smaller places like Allen's Green?
Yes. Allen's Green is within the area we cover, which takes in towns, villages and rural addresses. We survey roofs across London and the South East. Just mention lanes, gates or anything else about the route when you book.
What insurance do you have?
Every survey is covered by professional indemnity and public liability insurance.
How soon will I get the report?
That depends on the survey you book: the Basic Survey report arrives within 48 hours, the Standard Survey in 24 to 48 hours and the Premium Survey the same day. Reports are sent by email.
What do I do with the report?
You receive the written report by email, with photos and recommendations. It’s yours to share with a seller, insurer, roofer or managing agent, whichever applies.
Can you test a green or ballasted roof?
Sometimes. It depends on the build-up and the layers above the membrane and parts may need to be lifted. We’ll discuss it before we quote.
Is my roof suitable for ELD?
Not every roof is suitable. Some membranes conduct electricity and some roofs lack the layer the test needs. If your roof will not work, we’ll say so at the start.
Electronic leak detection in Allen's Green: local notes
Slate and clay tile are the usual coverings on older South East houses, with concrete tiles on many later estates. Next to the main roofs there is usually a flat roof somewhere, whether on an extension, a garage or a commercial unit. Much Hadham Palace, about 2.2 miles north-west, is one of the historic houses in the wider area around Allen's Green. On older houses around here, roofs often carry the marks of earlier repairs, from replaced slates to new lead, and any change of roofing material on a listed home needs checking with the council first.
Take an older house close to Former Church of St Anne: any flat roof added at the back or on a dormer is likely to be far younger, and less durable, than the main roof. Landlords with a home close to Sawbridgeworth station may find that a flat roof over a rented flat is easy to forget until the tenant reports a leak.
Allen's Green is about 3 miles south-west of Bishop's Stortford, in Hertfordshire. We survey roofs in Allen's Green and the surrounding area as part of our work across London and South East England. Allen's Green is one of the places in Hertfordshire we cover for electronic leak detection. There’s also a page for Chelmsford.
Here we cover the CM21 postcode area for electronic leak detection. Nearby, we also carry out electronic leak detection in Thorley (2 miles north-east), High Wych (2 miles south), Spellbrook (2 miles east), Sawbridgeworth (2 miles south-east) and Thorley Street (2 miles north-east). Within a short drive, we also cover Stevenage (13 miles west), Bishop's Stortford (3 miles north-east), Welwyn Garden City (13 miles west), Hoddesdon (8 miles south-west), Cheshunt (11 miles south-west) and Hatfield (15 miles west).
What’s near Allen's Green
For rail, the closest station is Sawbridgeworth station, about 2.5 miles south-east of the centre. Other landmarks nearby include Herts and Essex Hospital (3.4 miles north-east) and Harlow Mill (3.2 miles south). Open spaces near Allen's Green include Thorley Wash nature reserve.
Prices for electronic leak detection in Allen's Green
Prices always include VAT. What changes the price is:
- The use of thermal imaging or a drone
- Extensions, dormers and garages with roofs of their own
- Features like valleys, chimneys, dormers and parapets
- The size of the roof
For a price for your roof in Allen's Green, phone 07833 053749 or email us and tell us about the roof. The price is agreed before a date is set.
Helping us price your survey
The more you tell us, the easier it is to price the survey. When you contact us, tell us:
- What’s prompted the survey
- How the loft is reached, if there is one
- The kind of building and roof involved
- Your timetable, such as an exchange date
Most bookings start with a short call: phone 07833 053749 or drop us an email, and we will ask about the building and what you need. You’ll have a price before anything is arranged.
What you can safely check yourself
During heavy rain, look at the gutters from ground level or a window. Overflowing water can point to a blockage or a sagging run.
If you have a loft with safe access, take a look inside. Use a torch and stay on the joists or boards, and look for staining, damp timber or daylight coming through.
Before and after the survey
Some practical points come up on survey after survey. They apply to most roofs:
- Note where leaks show inside and when
- Test new membranes before covering them
- Do not leave water getting in
- Do not let outlets block
Keep the report with the roof’s records. It shows the condition of the membrane on that date.
Keep outlets and gutters on flat roofs clear. Standing water puts more pressure on any weak point.
For landlords and managing agents
An agent can book and manage the survey for a landlord, and the report can go to both. We agree a time with the tenant beforehand.
With a portfolio of properties, surveys can be booked for more than one address. To arrange surveys for several addresses, ring 07833 053749 or email us.
What happens on the day
The visit has one job: to look at the flat roof membrane as closely as is safe and record what we find. Everything we note and photograph goes into the written report. It normally takes as long as needed for the size of the roof and how it’s built, and we’ll give you a guide when quoting. In a small place like Allen's Green, access is usually the main thing to plan. Mention any outbuildings, barns or garages you want included, and anything about the roof you already know. Weekday and weekend visits are available.
- We agree the area to be tested.
- The surface is prepared for the chosen method.
- Testing runs across the agreed area.
- Each breach found is located and recorded.
- You receive the results to pass to your roofer.
Before we arrive
- If you’re buying, let the agent know when we’re coming
- Show us where any leaks or stains appear
- Check pets are kept safely away
Arrange a survey
We confirm the price for your roof before booking, so you know where you stand. Electronic leak detection is quoted for your roof, because the method depends on the roof. To book, phone 07833 053749 or drop us an email.